<template>
  <div class="sidebar">
    <el-menu class="sidebar-el-menu" :default-active="onRoutes" :collapse="collapse" background-color="#324157"
             text-color="#bfcbd9" active-text-color="#20a0ff" unique-opened router>
      <template v-for="item in items">
        <template v-if="item.subs">
          <el-submenu :index="item.index" :key="item.index">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <el-menu-item v-for="(subItem,i) in item.subs" :key="i" :index="subItem.index">
              {{ subItem.title }}
            </el-menu-item>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
  import bus from './bus';
  export default {
    data() {
      return {
        collapse: false,
        items: [
          {
            icon: 'el-icon-setting',
            index: 'dashboard',
            title: '系统首页'
          },
          {
            icon: 'el-icon-info',
            index: 'clientStatus',
            title: '客户端状态'
          },          
          {
            icon: 'el-icon-tickets',
            index: 'clientGroups',
            title: '客户端分组'
          },
          {
            icon: 'el-icon-tickets',
            index: 'table',
            title: '基础表格'
          },
          {
            icon: 'el-icon-message',
            index: 'tabs',
            title: 'tab选项卡'
          },
          {
            icon: 'el-icon-date',
            index: '3',
            title: '表单相关',
            subs: [
              {
                index: 'form',
                title: '基本表单'
              },
              {
                index: 'editor',
                title: '富文本编辑器'
              },
              {
                index: 'markdown',
                title: 'markdown编辑器'
              },
              {
                index: 'upload',
                title: '文件上传'
              }
            ]
          },
          // {
          //     icon: 'el-icon-star-on',
          //     index: 'charts',
          //     title: 'schart图表'
          // },
          {
            icon: 'el-icon-rank',
            index: 'drag',
            title: '拖拽列表'
          },
          {
            icon: 'el-icon-warning',
            index: 'permission',
            title: '权限测试'
          },
          {
            icon: 'el-icon-error',
            index: '404',
            title: '404页面'
          }
        ]
      }
    },
    computed: {
      onRoutes() {
        return this.$route.path.replace('/', '');
      }
    },
    created() {
      // 通过 Event Bus 进行组件间通信，来折叠侧边栏
      bus.$on('collapse', msg => {
        this.collapse = msg;
      })
    }
  }
</script>

<style scoped>
  .sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
  }

  .sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
  }

  .sidebar > ul {
    height: 100%;
  }
</style>
